What does the ULL suffix mean in a numeric literal in C programming?

ULL Suffix on Numeric Literals

In C programming, encountering code like line = addr & 0x3fULL can raise questions about the purpose of the ULL suffix appended to the hex number. Understanding this suffix requires exploring the concept of data types in numeric literals.

The ULL suffix signifies that the specified numeric literal represents an unsigned long long integer. According to the GCC manual, appending LL to an integer constant denotes a long long integer, while ULL denotes an unsigned long long integer.

This suffix modifier allows programmers to explicitly define the data type of the literal, ensuring correct calculations and data handling. For example, in the given code snippet, 0x3fULL specifies an unsigned long long int with the value 63 (0x3f in hexadecimal).

It's important to note that these suffixes became part of the C99 standard for ISO C. However, they were also supported as compiler extensions in earlier versions of C . With the introduction of C 11, ULL and LL were officially added to the C language specification.

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